Cat Door Latch with Stabilizer, 7 Sizes Adjustable Cat Door Holder Latch to Keep Dog Out of Litter Box, No-Drill Alternative of Pet Gates and Interior Pet Door, Pink, 2 Packs

I saw you are 2.5 weeks in. You are so early in the process. I thought my new cat and my resident cat would never stop hissing and having some tense moments. But finally after three months, things are settling down where I don’t hear hissing anymore. Some cats love each other immediately and some take a lot of time (and some cats are truly one cat households). I’ve used these to keep the doors opened a bit while still being to keep them separate. I’ve fed them treats near each other, fed them on opposite sides of a door to associate them with food, and watched all the Jackson Galaxy advice I could find. It definitely has gotten sooooooo much better but it has taken a lot of time and that’s normal.